Trichloroacetic Acid → Methyl 5-[cyanohydroxy(4-methylphenyl)methyl]-1-methylpyrrole-2-acetate

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Reaktionsschritte

A solution of 1.45 g (0.01 mole) of 4-methylbenzoylcyanide, 1.5 g (0.01 mole) of methyl 1-methylpyrrole-2-acetate and 40 mg (0.25 mmoles) of trichloroacetic acid in 4 ml of ether was stirred at 25° under nitrogen for 21 days. The precipitated solid was collected by filtration and washed with cold ether, than hexane. The combined filtrates were evaporated in vacuo. A second crop of crystals was taken from hexane. After recrystallization from toluene:hexane was obtained, 0.46 g (16 percent yield) of methyl 5-[cyanohydroxy(4-methylphenyl)-methyl]-1-methylpyrrole-2-acetate mp 117°-118°. H1NMR CDCl3 2.35 (s, 3 H); 3.35 (s, 3 H); 3.55 (s, 2H); 3.65 (s, 3 H); 5.90 (d, 1 H); 6.05 (d, 1H); 7.15 (d, 2H); 7.35 (d, 2H). MS m/e 281, 280, 266, 212 IRnujol 3425, 1700 cm-1.

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